Hi, did you try turning on "spiral vase" mode in the slicer? If your using it within PrusaSlicer, you can find it at: Print Settings -> Layers and Perimeters -> Spiral Vase.
Thanks for trying to help.
But in this case vase mode doesn't work, you can only print one piece at a time, and this is a modular rocket for my kid and he needs more structure 🙂
I can print in normal mode piece by piece and get good quality but it'll be a tedious job and take more time.
I just ask maybe someone has a magic trick but that is not the case.
I have to print piece by piece 🙂
how can I improve print quality?
Easiest place to start is to slow the print down by 50% using the front panel. If quality improves, you've got a big jump on knowing what to fix. If not, look for different problems. Normally, adding parts slows things down, but it's hard to say what's going on without seeing what you've got set. Save your current 3MF project file, zip it up, and attach it to a reply here so we can see your part & settings and give better recommendations.